Examine source code of Edge-dark-colors

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Edge-dark-colors",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(59, 59, 59)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(32, 32, 32)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(43, 43, 43)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(59, 59, 59)",
      "popup": "rgb(43, 43, 43)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(59, 59, 59)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{acf60ac0-51ae-4716-abf7-29279fe5ac17}"
    }
  }
}